Abstract
In this study, a new method is proposed to confirm the possibility of coexistence between the existing satellite services and potential fifth-generation (5G) cellular services in the millimeter-wave band according to the frequency-designation agenda of International Mobile Telecommunications (IMT)-2020 for 5G. To evaluate the accumulated interference power of numerous 5G systems distributed globally at a satellite receiver, we extend the satellite's interference reception area to the entire coverage area, from which only the land area is extracted using the geospatial terrain data of Earth in three dimensions. This enables more accurate interference assessment than conventional methods that only consider the footprint of the satellite's 3-dB beamwidth. We also place the IMT-2020 (5G) systems in the coverage area using the IMT-2020 parameters and modeling documents for the International Telecommunication Union's coexistence study. The propagation loss is modeled considering the clutter loss, building entry loss, and attenuation from atmospheric gases. Subsequently, we analyze the interference power received by a fixed satellite service (FSS) satellite operating in the same band and an Earth exploration satellite service (EESS) passive sensor operating in an adjacent channel. Our simulation shows that the FSS satellite receives up to 7.9dB more interference than that obtained from the existing method. Although this is a substantial difference, we find that the protection criteria is still satisfied. However, all EESS passive sensors do not meet the protection criteria in most scenarios, and additional frequency separation or interference mitigation techniques are required to protect these sensors. The proposed method is also applicable to the analysis of non-terrestrial network interference from airships, balloons, unmanned aerial vehicles, etc.
Highlights
Whenever the simulation result is repeated obtained by repeating a snapshot of IMT2020 network with randomness, the same scenario with the Monte Carlo simulation method, new random variables are set, and the a variation of the interference power received by satellite for each simulation snapshot is analyzed with regard to expressed as a cumulative distribution function (CDF)
In this work, we proposed an interference-analysis modeling method to check the coexistence of International Mobile Telecommunications (IMT)-2020 and the existing satellite services in the mmWave band in relation to the IMT-2020 frequency-designation agenda
We modeled the IMT-2020 using the modeling document proposed by International Telecommunication Union (ITU) and distributed the IMT-2020 with different environments in the entire coverage area
Summary
Previous studies analyzing the interference received by satellites in the mmWave band used two methods to calculate the interference. The propagation-loss model used by existing methods alone does not take into consideration various propagation phenomena occurring in the mmWave band To improve upon these weaknesses, the authors perform an initial study to calculate the interference of IMT-2020 at the satellite for FSS using IMT-2020 modeling, propagation loss, and terrain data proposed in ITU-R Recommendation [20], [21]. Using the terrain data and interpolation method, we remove the IMT-2020s distributed in the marine area of the coverage area and perform interference analysis considering only the IMT2020s distributed in the land area [24], [25] This allows similar modeling to the situation where satellites receive interference from ground-based IMT-2020. The BSs all assume an outdoor environment, and in the case of the UE, an outdoor or indoor environment is assumed according to a given probability
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